Touch driving circuit and touch display device

ABSTRACT

Embodiments of the disclosure relate to a touch driving circuit and a touch display device. There may be provided a touch driving circuit capable of attenuating noise in the touch sensing signal and enhancing the output signal by the integrator by transferring charge through a sample-and-hold driving path and a bypass driving path, inverting the polarity of the charge sampled by the sampling switching block, and increasing the number of times of sampling. Further, as the amount of charge transferred by the offset voltage control switch included in the sample-and-hold driving path and bypass driving path may be adjusted within an offset voltage range, the performance of touch sensing may be enhanced.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Republic of Korea PatentApplication No. 10-2021-0175282, filed on Dec. 9, 2021, which is herebyincorporated by reference in its entirety.

BACKGROUND Field

Embodiments of the disclosure relate to a touch driving circuit and atouch display device.

Description of Related Art

The display device recognizes the user's touch on the display panel andperforms input processing based on the recognized touch so as to providemore various functions to the user.

The display device may include touch electrodes disposed on the displaypanel and touch lines for driving the touch electrodes. The displaydevice may sense the user's touch by driving the touch electrode anddetecting a change in capacitance by the user's touch.

The display panel may include various electrodes and signal lines fordisplay driving as well as the touch electrodes and touch lines. Aparasitic capacitance may be formed between the touch electrode and thetouch line for touch sensing and the electrode and line for displaydriving and may degrade the performance of touch sensing.

SUMMARY

Embodiments of the disclosure may provide a touch driving circuit and atouch display device capable of enhancing the sensitivity of touchsensing while reducing the noise of a touch sensing signal.

Embodiments of the disclosure may provide a touch display devicecomprising: a plurality of touch electrodes included in a display panel;a plurality of touch lines supplying a touch driving signal to at leastone of the plurality of touch electrodes; and a touch driving circuitconfigured to drive the plurality of touch lines, the touch drivingcircuit including: a first sampling block configured to receive a firstsignal transferred through a first touch line from the plurality oftouch lines, the first sampling block including a first sample-and-holddriving path that is configured to sample the first signal and a firstbypass driving path that is configured to bypass the firstsample-and-hold driving path and output the first signal; a secondsampling block configured to receive a second signal transferred througha second touch line from the plurality of touch lines, the secondsampling block including a second sample-and-hold driving path that isconfigured to sample the second signal and a second bypass driving paththat is configured to bypass the second sample-and-hold driving path andoutput the second signal; a sampling switching block including a firstinput terminal and a second input terminal, the first input terminalelectrically connected with the first sample-and-hold driving path andthe second bypass driving path, and the second input terminalelectrically connected with the second sample-and-hold driving path andthe first bypass driving path; and a differential amplifier electricallyconnected with an output terminal of the sampling switching block.

Embodiments of the disclosure may provide a touch driving circuitcomprising: a first sampling block configured to receive a first signaltransferred through a first touch line, the first sampling blockincluding a first sample-and-hold driving path that is configured tosample the first signal and a first bypass driving path that isconfigured to bypass the first sample-and-hold driving path and outputthe first signal; a second sampling block configured to receive a secondsignal transferred through a second touch line, the second samplingblock including a second sample-and-hold driving path that is configuredto sample the second signal and a second bypass driving path that isconfigured to bypass the second sample-and-hold driving path and outputthe second signal; a sampling switching block including a first inputterminal electrically and a second input terminal, the first inputterminal connected with the first sample-and-hold driving path and thesecond bypass driving path, and the second input terminal electricallyconnected with the second sample-and-hold driving path and the firstbypass driving path; and a differential amplifier electrically connectedwith an output terminal of the sampling switching block.

In one embodiment, a touch display device comprises: a plurality oftouch electrodes included in a display panel; a plurality of touch linessupplying a touch driving signal to at least one of the plurality oftouch electrodes; and a touch driving circuit configured to drive theplurality of touch lines, the touch driving circuit including: aplurality of sampling blocks, each sampling block connected to acorresponding touch line from the plurality of touch lines; adifferential amplifier including a plurality of input terminals and anoutput terminal; and a switch block having a plurality of inputterminals that are connected to the plurality of sampling blocks and aplurality of output terminals that are connected to the plurality ofinput terminals of the differential amplifier, the switch blockconfigured to switch connection of each of the plurality of samplingblocks to different input terminals of the plurality of input terminalsof the differential amplifier, wherein each of the plurality of samplingblocks is configured to either sample a touch sensing signal on thecorresponding touch line that is connected to the sampling block orbypass the touch sensing signal to the switch block, and a magnitude ofan output signal at the output terminal of the differential amplifier isbased on a number of times each of the plurality of sampling blockssample the touch sensing signal.

According to embodiments of the disclosure, there may be provided atouch driving circuit and touch display device capable of enhancing theperformance of touch sensing by increasing the integral value of thetouch sensing signal using the sample-and-hold driving path and bypassdriving path and reducing noise by the driving of the sampling switchingblock.

DESCRIPTION OF DRAWINGS

The above and other objects, features, and advantages of the disclosurewill be more clearly understood from the following detailed description,taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a view schematically illustrating a configuration of a touchdisplay device according to embodiments of the disclosure;

FIG. 2 is a view illustrating an example of a structure of an integratorincluded in a touch driving circuit of a touch display device accordingto embodiments of the disclosure;

FIGS. 3 and 4 are views illustrating an example of a driving scheme ofan integrator according to embodiments of the disclosure;

FIGS. 5, 6, 7, and 8 are views illustrating another example of a drivingscheme of an integrator according to embodiments of the disclosure;

FIG. 9 is a view illustrating another example of a structure of anintegrator included in a touch driving circuit of a touch display deviceaccording to embodiments of the disclosure; and

FIG. 10 is a view illustrating another example of a driving scheme of anintegrator according to embodiments of the disclosure.

DETAILED DESCRIPTION

In the following description of examples or embodiments of thedisclosure, reference will be made to the accompanying drawings in whichit is shown by way of illustration specific examples or embodiments thatcan be implemented, and in which the same reference numerals and signscan be used to designate the same or like components even when they areshown in different accompanying drawings from one another. Further, inthe following description of examples or embodiments of the disclosure,detailed descriptions of well-known functions and componentsincorporated herein will be omitted when it is determined that thedescription may make the subject matter in some embodiments of thedisclosure rather unclear. The terms such as “including”, “having”,“containing”, “constituting” “make up of”, and “formed of” used hereinare generally intended to allow other components to be added unless theterms are used with the term “only”. As used herein, singular forms areintended to include plural forms unless the context clearly indicatesotherwise.

Terms, such as “first”, “second”, “A”, “B”, “(A)”, or “(B)” may be usedherein to describe elements of the disclosure. Each of these terms isnot used to define essence, order, sequence, or number of elements etc.,but is used merely to distinguish the corresponding element from otherelements.

When it is mentioned that a first element “is connected or coupled to”,“contacts or overlaps” etc. a second element, it should be interpretedthat, not only can the first element “be directly connected or coupledto” or “directly contact or overlap” the second element, but a thirdelement can also be “interposed” between the first and second elements,or the first and second elements can “be connected or coupled to”,“contact or overlap”, etc. each other via a fourth element. Here, thesecond element may be included in at least one of two or more elementsthat “are connected or coupled to”, “contact or overlap”, etc. eachother.

When time relative terms, such as “after,” “subsequent to,” “next,”“before,” and the like, are used to describe processes or operations ofelements or configurations, or flows or steps in operating, processing,manufacturing methods, these terms may be used to describenon-consecutive or non-sequential processes or operations unless theterm “directly” or “immediately” is used together.

In addition, when any dimensions, relative sizes etc. are mentioned, itshould be considered that numerical values for an elements or features,or corresponding information (e.g., level, range, etc.) include atolerance or error range that may be caused by various factors (e.g.,process factors, internal or external impact, noise, etc.) even when arelevant description is not specified. Further, the term “may” fullyencompasses all the meanings of the term “can”.

Hereinafter, various embodiments of the disclosure will be described indetail with reference to accompanying drawings.

FIG. 1 is a view schematically illustrating a configuration of a touchdisplay device 100 according to embodiments of the disclosure.

Referring to FIG. 1 , a touch display device 100 may include a displaypanel 110, a gate driving circuit 120, a data driving circuit 130, and acontroller 140 for driving the display panel 110.

The touch display device 100 may include a plurality of touch electrodesTE disposed on the display panel 110 for touch sensing. The touchdisplay device 100 may include a touch driving circuit 200 that drivesthe touch electrode TE and performs touch sensing.

The display panel 110 may include an active area AA in which a pluralityof subpixels SP are disposed and a non-active area NA positioned outsidethe active area AA. Each of the plurality of touch electrodes TE may bedisposed in an area corresponding to two or more subpixels SP.

A plurality of gate lines GL and a plurality of data lines DL may bedisposed on the display panel 110. The subpixels SP may be located wherethe gate lines GL and the data lines DL cross each other. A plurality oftouch lines TL electrically connected to the touch electrodes TE may bedisposed on the display panel 110.

A configuration for display driving in the touch display device 100 isdescribed. The gate driving circuit 120 may be controlled by thecontroller 140 to sequentially output scan signals to the plurality ofgate lines GL disposed in the display panel 110, controlling the drivingtiming of the subpixels SP.

The gate driving circuit 120 may include one or more gate driverintegrated circuits (GDICs). Depending on driving schemes, the gatedriving circuit 120 may be positioned on only one side, or each of twoopposite sides, of the display panel 110.

Each gate driver integrated circuit GDIC may be connected to a bondingpad of the display panel 110 using a tape automated bonding (TAB) methodor a chip on glass (COG) method. Alternatively, each gate driverintegrated circuit GDIC may be implemented in a gate in panel (GIP) typeand be disposed directly on the display panel 110. Alternatively, eachgate driver integrated circuit GDIC may be integrated and disposed onthe display panel 110. Each gate driver integrated circuit (GDIC) mayalso be implemented in a chip-on-film (COF) scheme to be mounted on afilm connected to the display panel 110.

The data driving circuit 130 receives image data from the controller 140and converts the image data into an analog data voltage. The datadriving circuit 130 outputs a data voltage to each data line DLaccording to the timing at which a scan signal is applied through thegate line GL, allowing each subpixel SP to represent a brightnessaccording to the image data.

The data driving circuit 130 may include one or more source driverintegrated circuits (SDICs).

Each source driver integrated circuit (SDIC) may include, e.g., shiftregisters, latch circuits, digital-analog converters, and outputbuffers.

Each source driver integrated circuit SDIC may be connected to a bondingpad of the display panel 110 using a tape automated bonding (TAB) methodor a chip on glass (COG) method. Alternatively, each source driverintegrated circuit SDIC may be directly disposed on the display panel110. Alternatively, each source driver integrated circuit SDIC may beintegrated and disposed on the display panel 110. Alternatively, eachsource driver integrated circuit SDIC may be implemented by a chip onfilm (COF) method. In this case, each source driver integrated circuitSDIC may be mounted on a film connected to the display panel 110 and maybe electrically connected to the display panel 110 through lines on thefilm.

The controller 140 may supply various control signals to the gatedriving circuit 120 and the data driving circuit 130 and control theoperation of the gate driving circuit 120 and the data driving circuit130.

The controller 140 may be mounted on a printed circuit board or aflexible printed circuit and may be electrically connected with the gatedriving circuit 120 and the data driving circuit 130 through the printedcircuit board or the flexible printed circuit.

The controller 140 enables the gate driving circuit 120 to output scansignals according to the timing set in each frame, converts image datareceived from the outside to meet the data signal format used by thedata driving circuit 130, and outputs the resultant image data to thedata driving circuit 130.

The controller 140 receives, from the outside (e.g., a host system),various timing signals including a vertical synchronization signalVSYNC, a horizontal synchronization signal HSYNC, an input data enablesignal DE, and a clock signal, along with the image data.

The controller 140 may generate a diversity of control signals using thetiming signals received from the outside and output the control signalsto the gate driving circuit 120 and the data driving circuit 130.

As an example, to control the gate driving circuit 120, the controller140 outputs various gate control signals GCS including a gate startpulse GSP, a gate shift clock GSC, and a gate output enable signal GOE.

The gate start pulse GSP controls the operation start timing of one ormore gate driver integrated circuits GDICs constituting the gate drivingcircuit 120. The gate shift clock GSC is a clock signal commonly inputto one or more gate driver integrated circuits GDICs and controls theshift timing of the scan signals. The gate output enable signal GOEdesignates timing information about one or more gate driver integratedcircuits GDICs.

To control the data driving circuit 130, the controller 140 outputsvarious data control signals DCS including, for example, a source startpulse SSP, a source sampling clock SSC, and a source output enablesignal SOE.

The source start pulse SSP controls the data sampling start timing ofone or more source driver integrated circuits SDICs constituting thedata driving circuit 130. The source sampling clock SSC is a clocksignal for controlling the sampling timing of data in each source driverintegrated circuit (SDIC). The source output enable signal SOE controlsthe output timing of the data driving circuit 130.

The touch display device 100 may further include a power managementintegrated circuit that supplies various voltages or currents to, e.g.,the display panel 110, the gate driving circuit 120, and the datadriving circuit 130 or controls various voltages or currents to besupplied.

A configuration for touch sensing in the touch display device 100 isdescribed. The touch display device 200 may drive a plurality of touchelectrodes TE disposed on the display panel 110.

The touch driving circuit 200 may supply a touch driving signal to thetouch electrode TE through the touch line TL and may receive a touchsensing signal from the touch electrode TE.

The touch driving circuit 200 may include various components for drivingthe touch electrode TE, processing the touch sensing signal, andtransmitting it to the outside. For example, the touch driving circuit200 may include a sensing unit 210 (e.g., a circuit), an integrator 220(e.g., a circuit), and an analog-to-digital converter 230.

The sensing unit 210 may supply the touch driving signal to the touchline TL and receive the touch sensing signal through the touch line TL.The sensing unit 210 may include a preamplifier and a feedbackcapacitor. In some cases, the sensing unit 210 may be sequentiallyconnected to two or more touch lines TL through a multiplexer, drive twoor more touch electrodes TE, and receive a touch sensing signal.

The integrator 220 may accumulate the charge according to the touchsensing signal obtained by the sensing unit 210. The integrator 220 mayoutput, to the analog-to-digital converter 230, the charge accumulatedwhile the touch sensing is performed.

The analog-to-digital converter 230 may generate digital sensing databased on the charge received from the integrator 220. The digitalsensing data generated by the analog-to-digital converter 230 may betransmitted to the touch controller.

The touch controller may control driving of the touch driving circuit200 and may detect the presence or absence and coordinates of a touchbased on the sensing data received from the touch driving circuit 200.

The touch electrode TE may be positioned outside the display panel 110or may be positioned inside the display panel 110.

When the touch electrode TE is positioned inside the display panel 110,the touch electrode TE may be an electrode disposed separately from anelectrode for display driving. Alternatively, the touch electrode TE maybe one of the electrodes for display driving.

For example, the touch electrode TE may be an electrode split from thecommon electrode for display driving.

In this case, the touch electrode TE may function as an electrode fortouch sensing and an electrode for display driving.

For example, the touch electrode TE may be driven as a common electrodeand a touch electrode TE in temporally split periods. Alternatively, thetouch electrode TE may simultaneously function as a touch electrode TEand a common electrode.

In this case, since the touch driving signal is applied to the touchelectrode TE during the display driving period, the signal for displaydriving (e.g., a data voltage or a scan signal) may be supplied in aform modulated based on the touch driving signal.

As another example, the touch electrode TE may be an electrode disposedseparately from the electrode for display driving.

An example in which the touch display device 100 is an organic lightemitting display device is described. The touch electrode TE may bedisposed in various positions depending on the direction in which thetouch display device 100 emits light.

When the touch display device 100 has a top emission structure, thetouch electrode TE may be disposed on the encapsulation layer thatencapsulates the light emitting element included in the display panel110. When the touch display device 100 has a bottom emission structure,the touch electrode TE may be positioned between the substrate and thelayer where the light emitting element is disposed and be positioned ona lower layer than the layer where the thin film transistor positionedunder the light emitting element is disposed.

When the touch electrode TE is separately disposed from the electrodefor display driving, the touch electrode TE may be driven during aperiod when display driving is performed and perform touch sensing.Alternatively, to enhance the performance of touch sensing, touchsensing may be performed in a period different from a period whendisplay driving is performed.

Embodiments of the disclosure may also provide a method for enhancingthe performance of touch sensing by reducing the influence of the noisedue to display driving on the touch sensing signal and enhancing theperformance of touch sensing signal detection of the touch drivingcircuit 200.

FIG. 2 is a view illustrating an example of a structure of an integrator220 included in a touch driving circuit 200 of a touch display device100 according to embodiments of the disclosure. FIGS. 3 and 4 are viewsillustrating an example of a driving scheme of an integrator 220according to embodiments of the disclosure. FIGS. 5 to 8 are viewsillustrating another example of a driving scheme of an integrator 220according to embodiments of the disclosure.

Referring to FIG. 2 , the integrator 220 included in the touch drivingcircuit 200 may include a first sampling block 221, a second samplingblock 222, a sampling switching block 223, and a differential amplifier224 according to one embodiment.

The first sampling block 221 may receive a first input signal INP. Thesecond sampling block 222 may receive a second input signal INM. Thefirst input signal INP and the second input signal INM may be signalsreceived through different touch lines TL. For example, the first inputsignal INP may be a signal received through a first touch line, and thesecond input signal INM may be a signal received through a second touchline. The phase of the first input signal INP may be different from thephase of the second input signal INM.

The first sampling block 221 may include a first sample-and-hold drivingpath 221 a and a first bypass driving path 221 b according to oneembodiment.

The second sampling block 222 may include a second sample-and-holddriving path 222 a and a second bypass driving path 222 b according toone embodiment.

Each of the first sample-and-hold driving path 221 a and the secondsample-and-hold driving path 222 a may include a first samplingcapacitor Csp1 and a plurality of switches sw1, sw2, sw3, and sw4according to one embodiment.

In one embodiment, each of the first sample-and-hold driving path 221 aand the second sample-and-hold driving path 222 a is configured tosample a respective signal received by its sampling block. The firstbypass driving path 221 b is configured to bypass the firstsample-and-hold driving path 221 a and output the signal received by thefirst sampling block 221 to the sampling switching block 223. Similarly,the second bypass driving path 221 a is configured to bypass the secondsample-and-hold driving path 222 a and output the signal received by thesecond sampling block 222 to the sampling switching block 223. In oneembodiment, the sampling switching block 223 is configured to switchconnection of each of the sampling blocks to different input terminalsof the differential amplifier 224 as will be further described below.

Among the plurality of switches sw1, sw2, sw3, and sw4, the first switchsw1 and the fourth switch sw4 may be connected to two opposite sides ofthe first sampling capacitor Csp1. For example, the first switch sw1 isconnected to a first end of the first sampling capacitor Csp1 and thefourth switch sw4 is connected to a second end of the first samplingcapacitor Csp1. The second switch sw2 may be electrically connected tothe input terminal of the first auxiliary voltage VTOP and a connectionpoint between the first switch sw1 and the first end of the firstsampling capacitor Csp1. The third switch sw3 may be electricallyconnected to the input terminal of the reference voltage VREF and aconnection point between the fourth switch sw4 and the second end of thefirst sampling capacitor Csp1. The first auxiliary voltage VTOP may bedifferent from the reference voltage VREF. The difference between thefirst auxiliary voltage VTOP and the reference voltage VREF may increaseor decrease the output signal according to the sampled charge.

Each of the first bypass driving path 221 b and the second bypassdriving path 222 b may include a second sampling capacitor Csp2 and aplurality of switches sw1, sw2, sw3, and sw4 according to oneembodiment.

Among the plurality of switches sw1, sw2, sw3, and sw4, the secondswitch sw2 and the fourth switch sw4 may be connected to two oppositesides of the second sampling capacitor Csp2. For example, the secondswitch sw2 is connected to a first end of the second sampling capacitorCsp2 and the fourth switch sw4 is connected to a second end of thesecond sampling capacitor Csp2. The first switch sw1 may be electricallyconnected to the input terminal of the second auxiliary voltage VBOP anda connection point between the second switch sw2 and the first end ofthe second sampling capacitor Csp2. The third switch sw3 may beelectrically connected to the input terminal of the reference voltageVREF and a connection point between the fourth switch sw4 and the secondend of the second sampling capacitor Csp2.

The first sample-and-hold driving path 221 a and the second bypassdriving path 222 b may be electrically connected to a first node N1. Thefirst node N1 may be referred to as the first input terminal of thesampling switching block 223.

The second sample-and-hold driving path 222 a and the first bypassdriving path 221 b may be electrically connected to a second node N2.The second node N2 may be referred to as the second input terminal ofthe sampling switching block 223.

The sampling switching block 223 may include a first positive samplingswitch swp1, a first negative sampling switch swn1, a second positivesampling switch swp2, and a second negative sampling switch swn2 in oneembodiment.

The first positive sampling switch swp1 may be electrically connectedbetween the first node N1 and a first input terminal of the differentialamplifier 224. The first input terminal of the differential amplifier224 may mean the input terminal electrically connected to the firstfeedback capacitor Cfb1.

The first negative sampling switch swn1 may be electrically connectedbetween the first node N1 and a second input terminal of thedifferential amplifier. The second input terminal of the differentialamplifier 224 may refer to the input terminal electrically connected tothe second feedback capacitor Cfb2.

The second positive sampling switch swp2 may be electrically connectedbetween the second node N2 and the second input terminal of thedifferential amplifier 224. The second negative sampling switch swn2 maybe electrically connected between the second node N2 and the first inputterminal of the differential amplifier 224.

The differential amplifier 224 may be electrically connected to thefirst feedback capacitor Cfb1, the second feedback capacitor Cfb2, andthe reset switch RST. The differential amplifier 224 may output a firstoutput signal OUTP and a second output signal OUTM. The differentialamplifier 224 may output a signal corresponding to the differencebetween the first output signal OUTP and the second output signal OUTMto the analog-to-digital converter 230.

An output signal of the integrator 220 may be generated according tooperations of the switches included in the first sampling block 221, thesecond sampling block 222, and the sampling switching block 223.

Referring to FIGS. 2 and 3 , FIG. 3 illustrates examples of a drivingscheme of the integrator 220 and a signal output by the integrator 220during one period of the touch driving signal that includes a firstperiod P1 and a second period P2.

The phase of the first input signal INP may be different from the phaseof the second input signal INM. In a first period P1 of one period ofthe touch driving signal, the phase of the first input signal INP mayhave a positive polarity, and the phase of the second input signal INMmay have a negative polarity. In a second period P2 of one period of thetouch driving signal, the phase of the first input signal INP may have anegative polarity, and the phase of the second input signal INM may havea positive polarity. Thus, the first input signal INP and the secondinput signal INM have opposite polarities during the first period P1 andthe second period P2.

In each of the first period P1 and the second period P2, the switchesincluded in the first sampling block 221 and the second sampling block222 may operate at least once, thereby performing sampling.

Further, the switches included in the sampling switching block 223 mayoperate at least once during one period of the touch driving signal,thereby performing sampling.

For example, the first positive sampling switch swp1 and the secondpositive sampling switch swp2 included in the sampling switching block223 may be turned on in the first period P1 corresponding to the periodwhen the phase of the first input signal INP has the positive polarity.The first negative sampling switch swn1 and the second negative samplingswitch swn2 included in the sampling switching block 223 may be turnedoff in the first period P1.

The first negative sampling switch swn1 and the second negative samplingswitch swn2 included in the sampling switching block 223 may be turnedon in the second period P2 corresponding to the period when the phase ofthe second input signal INM has the positive polarity. The firstpositive sampling switch swp1 and the second positive sampling switchswp2 included in the sampling switching block 223 may be turned off inthe second period P2.

Accordingly, the first positive sampling switch swp1 and the secondpositive sampling switch swp2 may be in a turned-on state at the timeindicated by {circle around (1)} in the first period P1. Further, thesecond switch sw2 and the fourth switch sw4 included in the firstsampling block 221 and the second sampling block 222 may be in aturned-on state at the time indicated by {circle around (1)} in thefirst period P1.

The charge according to the first input signal INP may be output, as thesecond output signal OUTM of the differential amplifier 224, through thefirst bypass driving path 221 b of the first sampling block 221.Further, the charge according to the second input signal INM may beoutput, as the first output signal OUTP of the differential amplifier224, through the second bypass driving path 222 b of the second samplingblock 222.

Since charge is bypassed and transferred to the differential amplifier224 without being accumulated in the second sampling capacitor Csp2included in the first bypass driving path 221 b and the second bypassdriving path 222 b, the polarity-inverted signal of the input signal maybe output as the output signal. The charge according to the positivefirst input signal INP may be output as the second output signal OUTMhaving negative polarity, and the charge according to the negativesecond input signal INM may be outputted as the first output signal OUTMhaving positive polarity OUTP.

As such, the output signal of the differential amplifier 224 may begenerated at the time indicated by {circle around (1)}.

Before the time indicated by {circle around (2)}, the switches includedin the first sampling block 221 and the second sampling block 222 mayoperate, performing sampling.

For example, during the first period P1, the second switch sw2 and thefourth switch sw4 may be turned off, and the first switch sw1 and thethird switch sw3 may be turned on. The period when the first switch sw1and the third switch sw3 are turned on may not overlap the period whenthe second switch sw2 and the fourth switch sw4 are turned on. A timegap may exist between the period when the first switch sw1 and the thirdswitch sw3 are turned on and the period when the second switch sw2 andthe fourth switch sw4 are turned on.

Since the first switch sw1 and the third switch sw3 are turned on, thecharge according to the input signal may be accumulated in the firstsampling capacitor Csp1 included in each of the first sample-and-holddriving path 221 a and the second sample-and-hold driving path 222 a. Asthe first switch sw1 and the third switch sw3 are turned off and, at thetime indicated by {circle around (2)}, the second switch sw2 and thefourth switch sw4 are turned on, the charge accumulated in the firstsampling capacitor Csp1 may be output through the differential amplifier224. Simultaneously, the charge bypassed through the first bypassdriving path 221 b and the second bypass driving path 222 b may beoutput through the differential amplifier 224.

For example, if the first switch sw1 and the third switch sw3 are turnedon, the charge according to the first input signal INP may beaccumulated in the first sampling capacitor Csp1 included in the firstsample-and-hold driving path 221 a. If the first switch sw1 and thethird switch sw3 are turned off and the second switch sw2 and the fourthswitch sw4 are turned on, the charge accumulated in the first samplingcapacitor Csp1 included in the first sample-and-hold driving path 221 amay be transferred to the first node N1 and be output as the firstoutput signal OUTP of the differential amplifier 224. Further, since thesecond switch sw2 and the fourth switch sw4 are turned on, the chargeaccording to the second input signal INM may be polarity-inverted andtransferred to the first node N1 through the second bypass driving path222 b and be output as the first output signal OUTP of the differentialamplifier 224.

Similarly, the polarity-inverted charge according to the second inputsignal INM by the second sample-and-hold driving path 222 a and thecharge according to the first input signal INP by the first bypassdriving path 221 b may be transferred to the second node N2 and beoutput as the second output signal OUTM of the differential amplifier224.

Since the charge is output through the sample-and-hold driving path andbypass driving path through one-time sampling, the magnitude of theoutput signal of the integrator may increase.

In the second period P2, at the time indicated by {circle around (3)},the first positive sampling switch swp1 and the second positive samplingswitch swp2 may be in the turned-off state, and the first negativesampling switch swn1 and the second negative sampling switch swn2 may bein the turned-on state. Since the second switch sw2 and the fourthswitch sw4 included in the first sampling block 221 and the secondsampling block 222 are in the turned-on state, an output signal of thedifferential amplifier 224 may be generated by the charge transferredthrough the first bypass driving path 221 b and the second bypassdriving path 222 b, similarly to the point indicated by {circle around(1)}.

In the second period P2, the first switch sw1 and the third switch sw3included in the first sampling block 221 and the second sampling block222 may be turned on, performing sampling.

Similar to the time indicated by {circle around (2)}, at the timeindicated by {circle around (4)}, an output signal of the differentialamplifier 224 may be generated according to the charge transferredthrough the sample-and-hold driving path and the chargepolarity-inverted and transferred through the bypass driving path.

The magnitude of the signal output by the integrator 220 may beincreased according to the number of times of sampling by the samplingblock during one period of the touch driving signal and the driving ofthe sampling switching block 223. A difference between the first outputsignal OUTP and the second output signal OUTM output by the integrator220 may be transferred to the analog-to-digital converter 230.

As such, since the magnitude of the signal output by the integrator 220increases, the performance of touch sensing by the touch driving circuit200 may be enhanced.

The magnitude of the output signal of the integrator 220 may be furtherincreased by increasing the number of times in which the sampling blockincluded in the integrator 220 operates.

Referring to FIGS. 2 and 4 , FIG. 4 illustrates other examples of adriving scheme of the integrator 220 and a signal output by theintegrator 220 during one period of the touch driving signal.

Sampling may be performed twice in the first period P1 of one period ofthe touch driving signal. The number of times in which the first switchsw1 and the third switch sw3 included in the first sampling block 221and the second sampling block 222 are turned on for sampling in thefirst period P1 may be two, for example. The number of times in whichthe second switch sw2 and the fourth switch sw4 included in the firstsampling block 221 and the second sampling block 222 are turned on inthe first period P1 may be two, for example. Further, sampling may beperformed twice in the second period P2. The number of times in whichthe first switch sw1 and third switch sw3 and the second switch sw2 andfourth switch sw4 included in the first sampling block 221 and thesecond sampling block 222 are turned on in the second period P2 may betwo, for example.

The switches included in the sampling switching block 223 may operate tocorrespond to the phase of the touch driving signal.

Accordingly, the output signal of the differential amplifier 224 may begenerated by the charge polarity-inverted and transferred through thebypass driving path included in the sampling block at the time indicatedby {circle around (1)} and the time indicated by {circle around (2)}.

During the first period P1, sampling may be performed twice by theoperations of the first switch sw1 and the third switch sw3.

The output signal of the differential amplifier 224 may be generated bythe charge transferred through the sample-and-hold driving path and thecharge polarity-inverted through the bypass driving path at the times{circle around (2)} and {circle around (3)} when the second switch sw2and the fourth switch sw4 are turned on. The period when the firstswitch sw1 and the third switch sw3 are turned on and the period whenthe second switch sw2 and the fourth switch sw4 are turned on may notoverlap and, as in the example shown in FIG. 3 , a time gap may existbetween the two periods.

Similarly, the output signal of the differential amplifier 224 may begenerated according to the charge transferred by the sample-and-holddriving path and the bypass driving path at the time indicated by{circle around (5)} and the time indicated by {circle around (6)}according to the operation of the switches included in the samplingblock during the second period P2.

As such, sampling may be performed a plurality of times during oneperiod of the touch driving signal. Further, sampling may be performedonce during a plurality of periods of the touch driving signal, andsampling may be performed multiple times during a plurality of periodsof the touch driving signal. In this case, the reset switch RST mayoperate once every multiple cycles of the touch driving signal.

As the charge transferred through the sample-and-hold driving path andthe bypass driving path is output, the magnitude of the output signal ofthe integrator 220 may increase. The magnitude of the output signal ofthe integrator 220 may be increased by increasing the number ofoperations of the switch included in the sampling block. Further, sincethe output signal of the differential amplifier 224 is generatedaccording to the operation of the sampling switching block 223, themagnitude of the output signal of the integrator 220 may be increased,and the performance of touch sensing may be enhanced.

Further, noise of the touch sensing signal may be reduced by adjustingthe operation timing of the sampling switching block 223.

FIG. 5 shows examples of a driving scheme of switches included in thesampling block of the integrator 220 and a driving scheme of switchesincluded in the sampling switching block 223 during two periods of theinput signal IN. For convenience of description, only one input signalIN is illustrated, and an example in which the touch driving signal is asine wave. The input signal IN shown in FIG. 5 may be a first inputsignal INP or a second input signal INM. Embodiments of the disclosuremay be applied even where the touch driving signal is a square wave, asin the above-described example, and may also be applied where touchsensing is performed by a touch driving signal of another waveform, suchas a sine wave or a trapezoidal wave illustrated in FIG. 5 .

The example illustrated in FIG. 5 illustrates an example in which thesampling switching block 223 operates once during one period of thetouch driving signal, similar to the examples illustrated in FIGS. 3 and4 . In the example shown in FIG. 5 , since the sampling switching block223 operates once during one period of the touch driving signal, thenumber of times in which the first positive sampling switch swp1 and thesecond positive sampling switch swp2 included in the sampling switchingblock 223 during one period of the touch driving signal may be one. Thenumber of times in which the first negative sampling switch swn1 and thesecond negative sampling switch swn2 included in the sampling switchingblock 223 are turned on during one period of the touch driving signalmay be one. The switches sw1, sw2, sw3, and sw4 included in the samplingblocks 221 and 222 may be turned on by the number of times of samplingduring one period of the touch driving signal.

For example, the first positive sampling switch swp1 and the secondpositive sampling switch swp2 included in the sampling switching block223 may be turned on in the period corresponding to the first period P1when the phase of the touch driving signal is positive.

In the first period P1, the phase of the input signal IN may bepositive, and in the second period P2, the phase of the input signal INmay be negative.

Since the first positive sampling switch swp1 and the second positivesampling switch swp2 included in the sampling switching block 223 areturned on in the first period P1 and the first negative sampling switchswn1 and the second negative sampling switch swn2 included in theswitching block 223 are turned off in the first period P1, sampling maybe performed through the path formed by the first positive samplingswitch swp1 and second positive sampling switch swp2. In this case, thepolarity of the sampling may be referred to as positive.

Since the first negative sampling switch swn1 and the second negativesampling switch swn2 included in the switching block 223 are turned onin the second period P2 and the first positive sampling switch swp1 andthe second positive sampling switch swp2 included in the samplingswitching block 223 are turned off in the second period P1, sampling maybe performed through the path formed by the first negative samplingswitch swn1 and the second negative sampling switch swn2. In this case,the polarity of the sampling may be referred to as negative.

If the polarity of sampling is changed by the operation of the samplingswitching block 223, noise having the same phase as the input signal INmay be removed. The noise attenuation effect may be increased bydiversifying the operation timing of the sampling switching block 223.

FIG. 6 illustrates an example in which the switches included in thesampling switching block 223 operates a plurality of times during oneperiod of the touch driving signal. (1) and (2) respectively indicatethe timing when positive sampling is performed and the timing whennegative sampling is performed for convenience of description.

In the first period P1, the first negative sampling switch swn1 and thesecond negative sampling switch swn2 of the sampling switching block 223may be turned on to perform negative sampling. Thereafter, the firstpositive sampling switch swp1 and the second positive sampling switchswp2 may be turned on to perform positive sampling. Further, thepolarity of sampling may be changed to negative once in the first periodP1 and be changed back to positive once.

In the second period P2, the polarity of the sampling may be changedonce to negative and once to positive.

A period when negative sampling is performed may exist in the periodcorresponding to a portion in which the phase of the touch drivingsignal is positive. Further, a period when positive sampling isperformed may exist in the period corresponding to a portion in whichthe phase of the touch driving signal is negative.

One period of the touch driving signal may include at least one periodwhen positive sampling is performed and at least one period whennegative sampling is performed.

As such, the polarity of the sampling may be changed a plurality oftimes in one period of the touch driving signal. In the example shown inFIG. 6 , the polarity of sampling is changed three times in the middleof one period of the touch driving signal and once at the edge, and thepolarity of sampling is changed aperiodically.

Noise attenuation for the frequency around the frequency of the touchdriving signal or its higher frequency is possible by inverting thepolarity of sampling by the sampling switching block 223. The reductionin the output signal of the integrator 220 by inverting the polarity ofsampling may be compensated by increasing the number of times ofsampling of the sampling block.

The positions and number of times when the polarity of sampling isinverted by the sampling switching block 223 may be set according to thefrequency of the noise.

As an example, referring to FIGS. 7 and 8 , FIG. 7 and FIG. 8 illustratean example of the operation timing of the sampling switching block 223according to the frequency of the noise for the input signal IN.

As in the example shown in FIG. 7 , inversion of the polarity ofsampling by the sampling switching block 223 may be performed in theposition where noise occurs in the frequency of the input signal IN.Inversion of polarity of sampling by the sampling switching block 223may be periodically performed according to the frequency of noise.

In the example shown in FIG. 8 , similar to the example shown in FIG. 7, inversion of the polarity of sampling by the sampling switching block223 may be performed in the position where noise is generated. Inversionof polarity of sampling by the sampling switching block 223 may beperiodically performed according to the frequency of noise.

Since the inversion of polarity of sampling is performed by the samplingswitching block 223, the noise of the frequency may be attenuated.

Further, since the number of times of sampling may be increased by theoperation of the sampling block, it is possible to remove external noisewhile compensating for the reduction in the output signal of theintegrator 220.

FIG. 9 is a view illustrating another example of a structure of anintegrator 220 included in a touch driving circuit 200 of a touchdisplay device 100 according to embodiments of the disclosure. FIG. 10is a view illustrating another example of a driving scheme of anintegrator 220 according to embodiments of the disclosure.

Referring to FIG. 9 , an integrator 220 may include a first samplingblock 221, a second sampling block 222, a sampling switching block 223,and a differential amplifier 224. Since the structure and operationscheme of the sampling switching block 223 are the same as those in theabove-described example, the related description will be omitted.

The first sampling block 221 may include a first sample-and-hold drivingpath 221 a and a first bypass driving path 221 b. The second samplingblock 222 may include a second sample-and-hold driving path 222 a and asecond bypass driving path 222 b.

Each of the first sampling block 221 and the second sampling block 222may include at least one offset voltage control switch swo forcontrolling the supply of a first offset voltage VOFF_T and a secondoffset voltage VOFF_B.

For example, the first sample-and-hold driving path 221 a of the firstsampling block 221 may include the first offset voltage control switchswo1 and the second offset voltage control switch swo2 electricallyconnected to the second switch sw2. The first offset voltage controlswitch swo1 may control the supply of the first offset voltage VOFF_T.The second offset voltage control switch swo2 may control the supply ofthe second offset voltage VOFF_B.

In some cases, the first sample-and-hold driving path 221 a may furtherinclude an additional offset voltage control switch swo electricallyconnected to the second switch sw2 to control the supply of thereference voltage VREF. In other words, the first sample-and-holddriving path 221 a may be configured to supply at least one voltageamong the first offset voltage VOFF_T, the second offset voltage VOFF_B,and the reference voltage VREF to the second switch sw2 through theoffset voltage control switch swo.

According to the operation of the first offset voltage control switchswo1 and the second offset voltage control switch swo2, the chargetransferred through the first sample-and-hold driving path 221 a may beincreased or decreased.

For example, referring to FIG. 10 , in the first period P1, the firstoffset voltage control switch swo1 may be turned on, and the secondoffset voltage control switch swo2 may be turned off.

Since the first offset voltage control switch swo1 is turned on, thesecond switch sw2 included in the first sample-and-hold driving path 221a may be electrically connected to the input terminal of the firstoffset voltage VOFF_T.

In the process in which the charge sampled by the first sample-and-holddriving path 221 a is transferred, the first switch sw1 and the thirdswitch sw3 may be turned on, so that charge may be accumulated in thefirst sampling capacitor Csp1. Thereafter, the first switch sw1 and thethird switch sw3 may be turned off, and the second switch sw2 and thefourth switch sw4 may be turned on. Since the second switch sw2 and thefourth switch sw4 are turned on, the charge accumulated in the firstsampling capacitor Csp1 may be transferred to the first node N1.

Here, while the charge is accumulated, the first sampling capacitor Csp1is connected to the reference voltage VREF. While the charge istransferred, the first sampling capacitor Csp1 may be connected to thefirst offset voltage VOFF_T. Accordingly, the charge corresponding tothe difference between the reference voltage VREF and the first offsetvoltage VOFF_T may be increased or decreased and be transferred to thefirst node N1.

For example, the first offset voltage VOFF_T may be a voltage higherthan the reference voltage VREF. The second offset voltage VOFF_B may bea voltage lower than the reference voltage VREF.

By controlling the degree to which the charge sampled by the firstsample-and-hold driving path 221 a is transferred, it is possible toadjust the output signal of the differential amplifier 224 by Δoffset.

Similarly, the second sample-and-hold driving path 222 a may alsoinclude at least one offset control switch swo connected to the secondswitch sw2 to control the supply of the first offset voltage VOFF_T andthe second offset voltage VOFF_B.

The first offset voltage control switch swo1 included in the secondsample-and-hold driving path 222 a may control the supply of the secondoffset voltage VOFF_B. The second offset voltage control switch swo2included in the second sample-and-hold driving path 222 a may controlthe supply of the first offset voltage VOFF_T.

Since the second sample-and-hold driving path 222 a operates byreceiving a signal having a polarity opposite to that of the signalinput to the first sample-and-hold driving path 221 a, the offsetvoltage VOFF whose supply is controlled by each of the first offsetcontrol switch swo1 and the second offset control switch swo2 may differfrom that of the first sample-and-hold driving path 221 a.

As such, it is possible to adjust the magnitude of the signal output bythe differential amplifier 224 by controlling the supply of the offsetvoltage VOFF.

The range of the entire offset that may be adjusted by the offsetvoltage control switch swo may be represented as follows when the firstoffset voltage VOFF_T is larger than the second offset voltage VOFF_B.ΣΔoffset=(VOFF_T−VOFF_B)/α×2×N

Here, α is the gain of the integrator 220 and may be a ratio of thecapacitance of the sampling capacitor Csp to the capacitance of thefeedback capacitor Cfb included in the integrator 220. N may mean thenumber of times in which sampling is performed in one period of thetouch driving signal.

In one time of sampling, the amount of charge corresponding to thedifference between the first offset voltage VOFF_T and the second offsetvoltage VOFF_B may be adjusted. The value obtained by dividing thedifference between the first offset voltage VOFF_T and the second offsetvoltage VOFF_B by the gain of the integrator 220 may be accumulated forN times and, since the output signal is doubled by the differentialamplifier 224, the range of the entire offset voltage may be representedas described above.

By controlling the operation of the offset voltage control switch swo inthe range of the entire offset voltage, the output signal of theintegrator 220 may be adjusted.

Therefore, according to embodiments of the disclosure, it is possible toenhance the performance of touch sensing of the touch driving circuit200 by attenuating noise by the operation of the sampling switchingblock 223 included in the integrator 220 and adjusting the output signalof the integrator 220 by the offset voltage switch swo while increasingthe magnitude of the output signal by multiple times of sampling by thesampling block.

The foregoing embodiments are briefly described below.

A touch display device 100 according to embodiments of the disclosuremay comprise a plurality of touch electrodes TE disposed on a displaypanel 110, a plurality of touch lines TL supplying a touch drivingsignal to at least one of the plurality of touch electrodes TE and atouch driving circuit 200 configured to drive the plurality of touchlines TL.

The touch driving circuit 200 may include a first sampling block 221receiving a signal transferred through a first touch line and includinga first sample-and-hold driving path 221 a and a first bypass drivingpath 221 b, a second sampling block 222 receiving a signal transferredthrough a second touch line and including a second sample-and-holddriving path 222 a and a second bypass driving path 222 b, a samplingswitching block 223 including a first input terminal electricallyconnected with the first sample-and-hold driving path 221 a and thesecond bypass driving path 222 b and a second input terminalelectrically connected with the second sample-and-hold driving path 222a and the first bypass driving path 221 b, and a differential amplifier224 electrically connected with an output terminal of the samplingswitching block 223.

The sampling switching block 223 may include a first positive samplingswitch swp1 electrically connected between the first input terminal anda first input terminal of the differential amplifier 224, a secondpositive sampling switch swp2 electrically connected between the secondinput terminal and a second input terminal of the differential amplifier224, a first negative sampling switch swn1 electrically connectedbetween the first input terminal and the second input terminal of thedifferential amplifier 224, and a second negative sampling switch swn2electrically connected between the second input terminal and the firstinput terminal of the differential amplifier 224.

The first positive sampling switch swp1 and the second positive samplingswitch swp2 may be simultaneously turned on during a positive samplingperiod, and the first negative sampling switch swn1 and the secondnegative sampling switch swn2 may be simultaneously turned on during anegative sampling period.

A period corresponding to a positive portion of the touch driving signalmay correspond to the positive sampling period, and a periodcorresponding to a negative portion of the touch driving signal maycorrespond to the negative sampling period.

A period corresponding to a positive portion of the touch driving signalmay include at least one negative sampling period, and a periodcorresponding to a negative portion of the touch driving signal mayinclude at least one positive sampling period.

During one cycle of the touch driving signal, the positive samplingperiod and the negative sampling period may alternate two or more times.

During one cycle of the touch driving signal, at least one of thepositive sampling period and the negative sampling period may beaperiodic.

Each of the first sample-and-hold driving path 221 a and the secondsample-and-hold driving path 222 a each may include two switchesconnected to two opposite sides of a sampling capacitor and turned onduring periods not overlapping each other.

The first bypass driving path 221 b and the second bypass driving path222 b each may include two switches connected to two opposite sides ofthe sampling capacitor and simultaneously turned on.

One of the two switches included in each of the first sample-and-holddriving path 221 a and the second sample-and-hold driving path 222 a maybe turned on during a period when the two switches included in each ofthe first bypass driving path 221 b and the second bypass driving path222 b are turned on.

The two switches included in the first sample-and-hold driving path 221a, the second sample-and-hold driving path 222 a, the first bypassdriving path 221 b, and the second bypass driving path 222 b may beturned on at least two times during one cycle of the touch drivingsignal.

Each of the first sampling block 221 and the second sampling block 222may include an offset voltage control switch swo electrically connectedwith a sampling switch to control supply of at least one of a firstoffset voltage VOFF_T and a first second voltage VOFF_B.

During a period when the first offset voltage VOFF_T is supplied throughthe offset voltage control switch swo included in the first samplingblock 221, the first second voltage VOFF_B may be supplied through theoffset voltage control switch swo included in the second sampling block222.

A phase of the signal transferred through the first touch line maydiffer from a phase of the signal transferred through the second touchline.

A touch driving circuit 200 according to embodiments of the disclosuremay include a first sampling block 221 receiving a signal transferredthrough a first touch line and including a first sample-and-hold drivingpath 221 a and a first bypass driving path 221 b, a second samplingblock 222 receiving a signal transferred through a second touch line andincluding a second sample-and-hold driving path 222 a and a secondbypass driving path 222 b, a sampling switching block 223 including afirst input terminal electrically connected with the firstsample-and-hold driving path 221 a and the second bypass driving path222 b and a second input terminal electrically connected with the secondsample-and-hold driving path 222 a and the first bypass driving path 221b, and a differential amplifier 224 electrically connected with anoutput terminal of the sampling switching block 223.

The above description has been presented to enable any person skilled inthe art to make and use the technical idea of the disclosure, and hasbeen provided in the context of a particular application and itsrequirements. Various modifications, additions and substitutions to thedescribed embodiments will be readily apparent to those skilled in theart, and the general principles defined herein may be applied to otherembodiments and applications without departing from the spirit and scopeof the disclosure. The above description and the accompanying drawingsprovide an example of the technical idea of the disclosure forillustrative purposes only. That is, the disclosed embodiments areintended to illustrate the scope of the technical idea of thedisclosure. Thus, the scope of the disclosure is not limited to theembodiments shown, but is to be accorded the widest scope consistentwith the claims. The scope of protection of the disclosure should beconstrued based on the following claims, and all technical ideas withinthe scope of equivalents thereof should be construed as being includedwithin the scope of the disclosure.

What is claimed is:
 1. A touch display device, comprising: a pluralityof touch electrodes included in a display panel; a plurality of touchlines supplying a touch driving signal to at least one of the pluralityof touch electrodes; and a touch driving circuit configured to drive theplurality of touch lines, the touch driving circuit including: a firstsampling block configured to receive a first signal transferred througha first touch line from the plurality of touch lines, the first samplingblock including a first sample-and-hold driving path that is configuredto sample the first signal and a first bypass driving path that isconfigured to bypass the first sample-and-hold driving path and outputthe first signal; a second sampling block configured to receive a secondsignal transferred through a second touch line from the plurality oftouch lines, the second sampling block including a secondsample-and-hold driving path that is configured to sample the secondsignal and a second bypass driving path that is configured to bypass thesecond sample-and-hold driving path and output the second signal; asampling switching block including a first input terminal and a secondinput terminal, the first input terminal electrically connected with thefirst sample-and-hold driving path and the second bypass driving path,and the second input terminal electrically connected with the secondsample-and-hold driving path and the first bypass driving path; and adifferential amplifier electrically connected with an output terminal ofthe sampling switching block.
 2. The touch display device of claim 1,wherein the sampling switching block includes: a first positive samplingswitch electrically connected between the first input terminal of thesampling switch block and a first input terminal of the differentialamplifier; a second positive sampling switch electrically connectedbetween the second input terminal of the sampling switch block and asecond input terminal of the differential amplifier; a first negativesampling switch electrically connected between the first input terminalof the sampling switch block and the second input terminal of thedifferential amplifier; and a second negative sampling switchelectrically connected between the second input terminal of the samplingswitch block and the first input terminal of the differential amplifier.3. The touch display device of claim 2, wherein the first positivesampling switch and the second positive sampling switch aresimultaneously turned on during a positive sampling period, and thefirst negative sampling switch and the second negative sampling switchare simultaneously turned on during a negative sampling period.
 4. Thetouch display device of claim 3, wherein a period corresponding to apositive portion of the touch driving signal corresponds to the positivesampling period during which the first positive sampling switch and thesecond positive sampling switch are simultaneously turned on, and aperiod corresponding to a negative portion of the touch driving signalcorresponds to the negative sampling period during which the firstnegative sampling switch and the second negative sampling switch aresimultaneously turned on.
 5. The touch display device of claim 4,wherein the period corresponding to the positive portion of the touchdriving signal includes at least one negative sampling period duringwhich the first negative sampling switch and the second negativesampling switch are simultaneously turned on, and the periodcorresponding to the negative portion of the touch driving signalincludes at least one positive sampling period during which the firstpositive sampling switch and the second positive sampling switch aresimultaneously turned on.
 6. The touch display device of claim 3,wherein during one cycle of the touch driving signal, the positivesampling period and the negative sampling period alternate a pluralityof times, or during one cycle of the touch driving signal, at least oneof the positive sampling period and the negative sampling period isaperiodic.
 7. The touch display device of claim 1, wherein each of thefirst sample-and-hold driving path and the second sample-and-holddriving path respectively include a first switch connected to a firstside of a first sampling capacitor and a second switch connected to asecond side of the sampling capacitor, wherein the first switch is notturned on while the second switch is turned on, and wherein each of thefirst bypass driving path and the second bypass driving pathrespectively include a third switch connected to a first side a secondsampling capacitor and a fourth switch connected to a second side of thesecond sampling capacitor, wherein the third switch and the fourthswitch are simultaneously turned on.
 8. The touch display device ofclaim 7, wherein the second switch respectively included in each of thefirst sample-and-hold driving path and the second sample-and-holddriving path is turned on while the third switch and the fourth switchrespectively included in each of the first bypass driving path and thesecond bypass driving path are turned on.
 9. The touch display device ofclaim 7, wherein the first switch and the second switch respectivelyincluded in each of the first sample-and-hold driving path and thesecond sample-and-hold driving path, and the third switch and the fourthswitch respectively included in each of the first bypass driving pathand the second bypass driving path are turned on a plurality of timesduring one cycle of the touch driving signal.
 10. The touch displaydevice of claim 1, wherein each of the first sampling block and thesecond sampling block respectively includes an offset voltage controlswitch that is electrically connected with a sampling switch, the offsetvoltage control switch and the sampling switch configured to controlsupply of at least one of a first offset voltage and a second offsetvoltage to the sampling switching block.
 11. The touch display device ofclaim 10, wherein during a period during which the first offset voltageis supplied through the offset voltage control switch and the samplingswitch included in the first sampling block, the second offset voltageis supplied through the offset voltage control switch and the samplingswitch included in the second sampling block.
 12. The touch displaydevice of claim 1, wherein a phase of the first signal transferredthrough the first touch line is different from a phase of the secondsignal transferred through the second touch line.
 13. A touch drivingcircuit, comprising: a first sampling block configured to receive afirst signal transferred through a first touch line, the first samplingblock including a first sample-and-hold driving path that is configuredto sample the first signal and a first bypass driving path that isconfigured to bypass the first sample-and-hold driving path and outputthe first signal; a second sampling block configured to receive a secondsignal transferred through a second touch line, the second samplingblock including a second sample-and-hold driving path that is configuredto sample the second signal and a second bypass driving path that isconfigured to bypass the second sample-and-hold driving path and outputthe second signal; a sampling switching block including a first inputterminal electrically and a second input terminal, the first inputterminal connected with the first sample-and-hold driving path and thesecond bypass driving path, and the second input terminal electricallyconnected with the second sample-and-hold driving path and the firstbypass driving path; and a differential amplifier electrically connectedwith an output terminal of the sampling switching block.
 14. A touchdisplay device, comprising: a plurality of touch electrodes included ina display panel; a plurality of touch lines supplying a touch drivingsignal to at least one of the plurality of touch electrodes; and a touchdriving circuit configured to drive the plurality of touch lines, thetouch driving circuit including: a plurality of sampling blocks, eachsampling block connected to a corresponding touch line from theplurality of touch lines; a differential amplifier including a pluralityof input terminals and an output terminal; and a switch block having aplurality of input terminals that are connected to the plurality ofsampling blocks and a plurality of output terminals that are connectedto the plurality of input terminals of the differential amplifier, theswitch block configured to switch connection of each of the plurality ofsampling blocks to different input terminals of the plurality of inputterminals of the differential amplifier, wherein each of the pluralityof sampling blocks is configured to either sample a touch sensing signalon the corresponding touch line that is connected to the sampling blockor bypass the touch sensing signal to the switch block, and a magnitudeof an output signal at the output terminal of the differential amplifieris based on a number of times each of the plurality of sampling blockssample the touch sensing signal.
 15. The touch display device of claim14, wherein the magnitude of the output signal increases as the numberof times each of the plurality of sampling blocks sample the touchsensing signal increases.
 16. The touch display device of claim 14,wherein the plurality of sampling blocks includes: a first samplingblock configured to receive a first touch sensing signal transferredthrough a first touch line from the plurality of touch lines, the firstsampling block including a first sample-and-hold driving path that isconfigured to sample the first touch sensing signal and a first bypassdriving path that is configured to bypass the first sample-and-holddriving path and output the first touch sensing signal to the switchblock; and a second sampling block configured to receive a second touchsensing signal transferred through a second touch line from theplurality of touch lines, the second sampling block including a secondsample-and-hold driving path that is configured to sample the secondtouch sensing signal and a second bypass driving path that is configuredto bypass the second sample-and-hold driving path and output the secondtouch sensing signal to the switch block.
 17. The touch display deviceof claim 16, wherein the plurality of input terminals of the switchblock including a first input terminal and a second input terminal, thefirst input terminal electrically connected with the firstsample-and-hold driving path and the second bypass driving path, and thesecond input terminal electrically connected with the secondsample-and-hold driving path and the first bypass driving path.
 18. Thetouch display device of claim 17, wherein the switch block includes: afirst positive sampling switch electrically connected between the firstinput terminal of the switch block and a first input terminal from theplurality of input terminals of the differential amplifier; a secondpositive sampling switch electrically connected between the second inputterminal of the switch block and a second input terminal from theplurality of input terminals of the differential amplifier; a firstnegative sampling switch electrically connected between the first inputterminal of the switch block and the second input terminal of thedifferential amplifier; and a second negative sampling switchelectrically connected between the second input terminal of the switchblock and the first input terminal of the differential amplifier. 19.The touch display device of claim 18, wherein the first positivesampling switch and the second positive sampling switch aresimultaneously turned on during a positive sampling period, and thefirst negative sampling switch and the second negative sampling switchare simultaneously turned on during a negative sampling period.
 20. Thetouch display device of claim 19, wherein a period corresponding to apositive portion of the touch driving signal corresponds to the positivesampling period during which the first positive sampling switch and thesecond positive sampling switch are simultaneously turned on, and aperiod corresponding to a negative portion of the touch driving signalcorresponds to the negative sampling period during which the firstnegative sampling switch and the second negative sampling switch aresimultaneously turned on, and wherein the period corresponding to thepositive portion of the touch driving signal includes at least onenegative sampling period during which the first negative sampling switchand the second negative sampling switch are simultaneously turned on,and the period corresponding to the negative portion of the touchdriving signal includes at least one positive sampling period duringwhich the first positive sampling switch and the second positivesampling switch are simultaneously turned on.